'use client';

import { useState } from 'react';
import { useSearchParams } from 'next/navigation';
import { useQuery } from '@tanstack/react-query';
import { DashboardShell } from '@/components/layouts/dashboard-shell';
import { Card, CardContent, Button, SortableHeader, cn } from '@horux/shared-ui';
import { apiClient } from '@/lib/api/client';
import { useContribuyenteStore } from '@/stores/contribuyente-store';
import { formatCurrency, toCfdiDate } from '@/lib/utils';
import { exportToExcel } from '@/lib/export-excel';
import { useTableSort } from '@horux/shared-ui';
import { CfdiViewerModal } from '@/components/cfdi/cfdi-viewer-modal';
import { getCfdiById } from '@/lib/api/cfdi';
import { Eye, Download } from 'lucide-react';
import type { Cfdi } from '@horux/shared';

const EXCEL_COLUMNS = [
  { header: 'UUID', key: 'uuid', width: 40 },
  { header: 'Comprobante', key: 'tipoComprobante', width: 12 },
  { header: 'Fecha Emision', key: '_fecha', width: 15 },
  { header: 'RFC Emisor', key: 'rfcEmisor', width: 15 },
  { header: 'Nombre Emisor', key: 'nombreEmisor', width: 30 },
  { header: 'RFC Receptor', key: 'rfcReceptor', width: 15 },
  { header: 'Nombre Receptor', key: 'nombreReceptor', width: 30 },
  { header: 'Total MXN', key: '_totalMxn', width: 15 },
  { header: 'Monto Pago MXN', key: '_montoPagoMxn', width: 15 },
  { header: 'IVA Trasladado MXN', key: '_ivaMxn', width: 18 },
  { header: 'Metodo Pago', key: 'metodoPago', width: 12 },
  { header: 'Regimen Emisor', key: 'regimenEmisor', width: 15 },
  { header: 'Regimen Receptor', key: 'regimenReceptor', width: 15 },
];

function prepareRows(data: any[]) {
  return data.map((c) => ({
    ...c,
    _fecha: toCfdiDate(c.fechaEmision).toLocaleDateString('es-MX'),
    _totalMxn: Number(c.totalMxn || 0),
    _montoPagoMxn: Number(c.montoPagoMxn || 0),
    _ivaMxn: Number(c.ivaTrasladoMxn || 0),
  }));
}

export default function DrillDownPage() {
  const searchParams = useSearchParams();
  const titulo = searchParams.get('titulo') || 'Detalle de CFDIs';
  const [selectedCfdi, setSelectedCfdi] = useState<Cfdi | null>(null);
  const [loadingCfdiId, setLoadingCfdiId] = useState<number | null>(null);
  const { selectedContribuyenteId } = useContribuyenteStore();

  const params = new URLSearchParams();
  for (const [key, value] of searchParams.entries()) {
    if (key !== 'titulo') params.set(key, value);
  }
  // Respetar contribuyente seleccionado globalmente — así cualquier drillUrl
  // construido desde dashboard/impuestos/etc queda automáticamente filtrado
  // sin tener que acordarse de pasarlo en cada call-site. El URLSearchParams
  // de entrada gana si el caller sí lo pasó explícitamente.
  if (selectedContribuyenteId && !params.has('contribuyenteId')) {
    params.set('contribuyenteId', selectedContribuyenteId);
  }

  const { data, isLoading } = useQuery({
    queryKey: ['drill-down', params.toString()],
    queryFn: async () => {
      const res = await apiClient.get<Cfdi[]>(`/cfdi/drill-down?${params}`);
      return res.data;
    },
  });

  const { sortedData, toggleSort, getSortIndicator } = useTableSort<Cfdi, 'fecha' | 'total' | 'pago' | 'iva'>(
    data,
    {
      fecha: (c) => toCfdiDate(c.fechaEmision).getTime(),
      total: (c) => Number(c.totalMxn || 0),
      pago: (c) => Number(c.montoPagoMxn || 0),
      iva: (c) => Number(c.ivaTrasladoMxn || 0),
    },
    'fecha',
  );

  // Total con signo: tipo E resta (es una nota de crédito que reduce el bucket).
  // Tipo I/N suman total_mxn; tipo P suma monto_pago_mxn (su total es 0 por convención
  // del complemento). Así el total del header coincide con los KPIs del dashboard.
  const totalMxn = data?.reduce((s, r) => {
    const sign = r.tipoComprobante === 'E' ? -1 : 1;
    const amount = r.tipoComprobante === 'P'
      ? Number(r.montoPagoMxn || 0)
      : Number(r.totalMxn || 0);
    return s + sign * amount;
  }, 0) || 0;
  const totalPagos = data?.reduce((s, r) => s + Number(r.montoPagoMxn || 0), 0) || 0;

  const handleExport = () => {
    if (!sortedData || sortedData.length === 0) return;
    exportToExcel(prepareRows(sortedData), EXCEL_COLUMNS, 'drill-down-cfdis');
  };

  return (
    <DashboardShell title={titulo}>
      <Card>
        <CardContent className="pt-6">
          {isLoading ? (
            <div className="text-center py-8 text-muted-foreground">Cargando...</div>
          ) : !data || data.length === 0 ? (
            <div className="text-center py-8 text-muted-foreground">No hay CFDIs que coincidan con los filtros</div>
          ) : (
            <>
              <div className="flex items-center justify-between mb-4">
                <p className="text-sm text-muted-foreground">{data.length} CFDIs encontrados</p>
                <div className="flex items-center gap-4 text-sm">
                  <span>Total MXN: <strong>{formatCurrency(totalMxn)}</strong></span>
                  {totalPagos > 0 && <span>Pagos MXN: <strong>{formatCurrency(totalPagos)}</strong></span>}
                  <Button variant="outline" size="sm" onClick={handleExport}>
                    <Download className="h-4 w-4 mr-1" />
                    Excel
                  </Button>
                </div>
              </div>
              <div className="overflow-x-auto">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="border-b text-left text-muted-foreground">
                      <th className="pb-3 font-medium">UUID</th>
                      <th className="pb-3 font-medium">Comp.</th>
                      <SortableHeader label="Fecha" active={getSortIndicator('fecha')} onClick={() => toggleSort('fecha')} />
                      <th className="pb-3 font-medium">RFC Emisor</th>
                      <th className="pb-3 font-medium">Nombre Emisor</th>
                      <th className="pb-3 font-medium">RFC Receptor</th>
                      <th className="pb-3 font-medium">Nombre Receptor</th>
                      <SortableHeader label="Total MXN" align="right" active={getSortIndicator('total')} onClick={() => toggleSort('total')} />
                      <SortableHeader label="Monto Pago" align="right" active={getSortIndicator('pago')} onClick={() => toggleSort('pago')} />
                      <SortableHeader label="IVA Trasl." align="right" active={getSortIndicator('iva')} onClick={() => toggleSort('iva')} />
                      <th className="pb-3 font-medium">M. Pago</th>
                      <th className="pb-3 font-medium">Reg. E</th>
                      <th className="pb-3 font-medium">Reg. R</th>
                      <th className="pb-3 font-medium"></th>
                    </tr>
                  </thead>
                  <tbody>
                    {(sortedData || []).map((cfdi: any) => {
                      const isNC = cfdi.tipoComprobante === 'E';
                      return (
                      <tr key={cfdi.id} className={cn('border-b hover:bg-muted/50', isNC && 'bg-red-50/50 dark:bg-red-950/20')}>
                        <td className="py-2 font-mono text-xs" title={cfdi.uuid}>{cfdi.uuid?.substring(0, 8)}</td>
                        <td className={cn('py-2 text-xs font-mono', isNC && 'text-red-600 dark:text-red-400 font-semibold')} title={isNC ? 'Nota de crédito — resta del total' : undefined}>{cfdi.tipoComprobante}</td>
                        <td className="py-2 text-xs">{toCfdiDate(cfdi.fechaEmision).toLocaleDateString('es-MX')}</td>
                        <td className="py-2 font-mono text-xs">{cfdi.rfcEmisor}</td>
                        <td className="py-2 text-xs truncate max-w-[120px]" title={cfdi.nombreEmisor}>{cfdi.nombreEmisor}</td>
                        <td className="py-2 font-mono text-xs">{cfdi.rfcReceptor}</td>
                        <td className="py-2 text-xs truncate max-w-[120px]" title={cfdi.nombreReceptor}>{cfdi.nombreReceptor}</td>
                        <td className={cn('py-2 text-right text-xs font-medium', isNC && 'text-red-600 dark:text-red-400')}>{isNC ? '−' : ''}{formatCurrency(Number(cfdi.totalMxn))}</td>
                        <td className="py-2 text-right text-xs">{cfdi.tipoComprobante === 'P' && cfdi.montoPagoMxn ? formatCurrency(Number(cfdi.montoPagoMxn)) : '-'}</td>
                        <td className="py-2 text-right text-xs">{cfdi.ivaTrasladoMxn ? formatCurrency(Number(cfdi.ivaTrasladoMxn)) : '-'}</td>
                        <td className="py-2 text-xs">{cfdi.metodoPago || '-'}</td>
                        <td className="py-2 text-xs font-mono">{cfdi.regimenEmisor || '-'}</td>
                        <td className="py-2 text-xs font-mono">{cfdi.regimenReceptor || '-'}</td>
                        <td className="py-2">
                          <Button
                            variant="ghost"
                            size="sm"
                            disabled={loadingCfdiId === cfdi.id}
                            onClick={async () => {
                              setLoadingCfdiId(cfdi.id);
                              try {
                                const fullCfdi = await getCfdiById(String(cfdi.id));
                                setSelectedCfdi(fullCfdi);
                              } catch (err) {
                                console.error('Error cargando CFDI completo:', err);
                              } finally {
                                setLoadingCfdiId(null);
                              }
                            }}
                            title="Ver factura"
                          >
                            <Eye className="h-4 w-4" />
                          </Button>
                        </td>
                      </tr>
                      );
                    })}
                  </tbody>
                </table>
              </div>
            </>
          )}
        </CardContent>
      </Card>

      <CfdiViewerModal
        cfdi={selectedCfdi}
        open={!!selectedCfdi}
        onClose={() => setSelectedCfdi(null)}
      />
    </DashboardShell>
  );
}